Can invasive ductal carcinoma spread to other parts of the body?

Yes: Depending on the stage, untreated it will definitely spread, if caught early and treated, then less likely, but monitoring for a long time (5-10 years) is necessary.

We hope not.: What makes a cancer "evil" is the ability of cancer cells to travel outside of the organ where they arose and take over another organ; this is how cancer can be life-threatening. In advanced cases of cancer, we can identify these "invaders", but most often, these cells are present but undetectable. The stage of the cancer gives us an estimate of this probability, leading to the rec for chemorx.